US6213232B1 - Drilling tool helical shank formed from a polygonal profile bar - Google Patents

Drilling tool helical shank formed from a polygonal profile bar Download PDF

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Publication number
US6213232B1
US6213232B1 US09/424,502 US42450299A US6213232B1 US 6213232 B1 US6213232 B1 US 6213232B1 US 42450299 A US42450299 A US 42450299A US 6213232 B1 US6213232 B1 US 6213232B1
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US
United States
Prior art keywords
drilling tool
shank
profile bar
clamping
polygonal profile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US09/424,502
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English (en)
Inventor
Wolfgang Peetz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch Power Tools GmbH
Original Assignee
Hawera Probst GmbH
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Filing date
Publication date
Application filed by Hawera Probst GmbH filed Critical Hawera Probst GmbH
Assigned to HAWERA PROBST GMBH reassignment HAWERA PROBST GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PEETZ, WOLFGANG
Application granted granted Critical
Publication of US6213232B1 publication Critical patent/US6213232B1/en
Anticipated expiration legal-status Critical
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • E21B10/445—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts percussion type, e.g. for masonry
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel
    • Y10T408/9097—Spiral channel

Definitions

  • the invention relates to a drilling tool, in particular a rock drill according to the preamble of claim 1 .
  • Drilling tools and, in particular, rock drills consist generally of, a drilling head fitted with a carbide cutting plate, of a helical shank with a spiral conveying helix for drilling dust or drillings and of a clamping shank for inserting the drilling tool into a drive machine.
  • the spiral conveying helix of a rock drill is produced generally by cutting away chips, if appropriate also without cutting (for example, by rolling rollers), in order to introduce the conveying helix grooves into the generally cylindrical initial material.
  • the main function of the conveying helix is to convey the material released by the carbide cutter, that is to say the drilling dust or else drillings, out of the drillhole.
  • Cylindrical initial materials of this kind are available in a wide variety of dimensions, so that a narrow graduation of drilling diameters can be produced.
  • the known drilling tools are fundamentally based on the fact that the helical shank has a cylindrical initial cross section, since the introduction of one or more conveying helix grooves gives rise to continuous ridges of the conveying helix groove which lie on an outer cylindrical surface. This is intended to ensure that drilling proceeds quietly or with little vibration, with the conveying helix being guided accurately along the conveying helix ridges.
  • the object on which the invention is based is to provide a drilling tool and, in particular, a rock drill, which has improved handling properties, as compared with conventional drilling tools, along with a drilling capacity which is at least equal to that of these drilling tools.
  • the invention is based on the knowledge that an increased drilling capacity can be achieved by reducing the frictional losses and increasing the conveying capacity, in that the cross section of the initial material for the conveying helix is not circular, but is replaced by a preferably symmetric polygonal profile.
  • the remaining ridges are composed of surface portions which are lined up with one another and which, in turn, form additional pockets for transporting the drilling dust. Markedly reduced wall friction is thereby established, since the ridge of the conveying helix does not have any surface contact, but at most linear contact.
  • the clamping shank is also designed as a polygonal profile in the manner of a polygonal course, that is to say the complete drilling tool consists of the same polygonal profile, in which conveying helix grooves are introduced by cutting away chips.
  • the polygonal clamping shank brings about a positive takeup, so that spinning of the drilling tool, particularly also in the case of jaw chucks having a relatively low clamping force, for example due to wear or the like, is virtually ruled out.
  • a multiplicity of drill sizes can therefore be produced in various dimensions by means of commercially available polygonal profile bars merely by the introduction of conveying helix grooves, the clamping shank affording the advantage of positive takeup in the multijaw chuck.
  • the polygonal profile bar must have, at least in the region of the clamping shank, clamping surfaces arranged so as to be offset by 120°.
  • the clamping shank may also have a cylindrical cross section, in order to adapt the clamping shank to the drill receptacle, for example in hammer drilling machines.
  • extruded blanks are preferably used, which are provided in the region of the conveying helix as a polygonal profile and in the region of the clamping shank with a cylindrical profile.
  • the clamping shank can then be adapted to the respective conditions for use, for example in hammer drilling machines, whilst the helical shank having the conveying helix described is produced by cutting away chips.
  • such an embodiment may be produced as an extruded blank or forged blank, so as to allow for any desired diameter variants and cross-sectional forms in the initial shapes with a polygonal profile in the region of the helical shank and with a, for example, cylindrical profile in the region of the clamping shank.
  • the helical shank and clamping shank may, however, also be connected to one another in their respective shapes by means of a suitable welding method (for example friction welding method, resistance welding method and the like).
  • a suitable welding method for example friction welding method, resistance welding method and the like.
  • FIG. 1 shows a perspective view of a rock drill with a hexagonal cross section
  • FIG. 2 shows a side view of the rock drill according to FIG. 1;
  • FIG. 2 a shows a top view of the rock drill according to FIG. 2;
  • FIG. 2 b shows an enlarged illustration of FIG. 2 a
  • FIG. 2 c shows a view of the lower end of the rock drill according to FIG. 2;
  • FIG. 3 shows the rock drill according to FIG. 2, rotated through 90°, that is to say its side view
  • FIG. 4 shows a perspective of a further variant of a rock drill
  • FIG. 5 shows a side view of the rock drill according to FIG. 4;
  • FIG. 5 a shows a top view of the rock drill according to FIG. 5;
  • FIG. 5 b shows an enlarged illustration according to FIG. 5 a
  • FIG. 6 shows a side view of the rock drill according to FIG. 5;
  • FIG. 7 shows a side view of an initial blank for producing the tool according FIGS. 5 to 6 ;
  • FIG. 7 a shows a top view of the blank according to FIG. 7.
  • FIG. 8 shows a side view of the blank according to FIG. 7 .
  • the first exemplary embodiment illustrated in FIGS. 1 to 3 shows a rock drill 1 with a drill head 2 , a helical shank 3 and a clamping shank 4 .
  • the drill head 2 has a commercially available rooflike carbide cutting blade 5 which with its outside diameter D forms the nominal diameter of the drill.
  • the initial material used for producing the rock drill 1 is a commercially available hexagonal steel, such as is available, for example, in a very wide variety of dimensions in DIN 176, DIN 1015 or DIN 59110.
  • the width across flats s serves, here, for determining the respective dimensions.
  • the diagonal 8 drawn through the respective corner points 7 of the hexagonal profile 6 has a length of d 1 which corresponds to the diameter of the circumscribed circle 9 through the corner points 7 .
  • a conveying helix groove 10 is introduced by cutting away chips into such a hexagonal profile 6 extending over the clamping shank and the helical shank, the polygonal profile being maintained in full in the region of the ridges 11 .
  • the ridges are consequently composed of plane surface portions 12 to 17 which conventionally form the wrench surfaces of the hexagonal profile 6 .
  • These surface portions 12 to 17 are interrupted by vertical longitudinal edges 7 ′ which run through the corner points 7 of the hexagonal cross section.
  • the overall conveying volume is, of course, formed by the interspace between the circumscribed circle 19 having the nominal diameter D and the corresponding surface portions 12 to 17 as well as the conveying helix grooves 10 .
  • the top view according to FIG. 2 b shows, by-way of example, an entry region 20 into the conveying helix groove 10 located below it, that is to say the head support 21 for the carbide cutting plate 5 supports the latter in each case in an approximately V-shaped manner, as seen in a top view.
  • the direction of rotation is identified here by the arrow 22 .
  • the carbide cutting plate 5 is inserted into the drill head 2 in such a way that two corner points 7 located opposite one another delimit the cutting plate 5 approximately on both sides.
  • the surface portions 12 to 17 run as wrench surfaces over the entire drilling tool and therefore form the characteristic conveying helix with flattened vertical surface portions which are interrupted by the respective conveying helix groove 10 .
  • the clamping shank possesses a form-fitting polygonal profile which is suitable, in particular, for rotation-proof insertion in a percussion drilling machine, for example with a three-jaw chuck.
  • FIGS. 4 to 6 An alternative embodiment of the invention is illustrated in FIGS. 4 to 6 . Parts identical to those described with reference to FIGS. 1 to 3 are given the same reference symbols.
  • the rock drill 1 ′ illustrated in FIGS. 4 to 6 therefore has, in turn, a drill head 2 , a helical shank 3 and a clamping shank 4 .
  • the design of the helical shank 3 together with the drill head 2 is identical to the exemplary embodiment according to FIGS. 1 to 3 .
  • Only the clamping shank 4 is designed, for example, as a cylindrical clamping end 4 ′.
  • a profile bar such as is illustrated in more detail in FIGS. 7 and 8, may serve as initial material for producing a drilling tool according to FIGS. 4 to 6 .
  • a profile may be produced by an extrusion method or a forging method jointly with a cylindrical clamping shank 4 , in which case the cylindrical clamping shank 4 has, for example, a diameter d 3 , such as is required for producing an SDS-plus clamping end of a hammer drilling machine.
  • the hexagonal profile 6 is characterized by its width across flats s and is produced by a joint extrusion method or forging method together with a clamping shank.
  • the conveying helix grooves 10 are then, once again, introduced by a chip-cutting work method.
  • the clamping end is adapted, as required, to the drill chuck of a hammer drilling machine. This may be, in particular, an SDS-plus clamping end.
  • the helical shank 3 and the cylindrical clamping shank 4 ′ may also be connected to one another by a suitable welding method.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
US09/424,502 1997-05-30 1998-05-15 Drilling tool helical shank formed from a polygonal profile bar Expired - Fee Related US6213232B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19722519 1997-05-30
DE19722519A DE19722519A1 (de) 1997-05-30 1997-05-30 Bohrwerkzeug
PCT/DE1998/001376 WO1998054435A1 (de) 1997-05-30 1998-05-15 Bohrwerkzeug

Publications (1)

Publication Number Publication Date
US6213232B1 true US6213232B1 (en) 2001-04-10

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Family Applications (1)

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US09/424,502 Expired - Fee Related US6213232B1 (en) 1997-05-30 1998-05-15 Drilling tool helical shank formed from a polygonal profile bar

Country Status (6)

Country Link
US (1) US6213232B1 (zh)
EP (1) EP1015727B1 (zh)
CN (1) CN1094168C (zh)
DE (2) DE19722519A1 (zh)
DK (1) DK1015727T3 (zh)
WO (1) WO1998054435A1 (zh)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030180108A1 (en) * 2002-03-25 2003-09-25 Gongola Andrew G. Boring bit and methods for manufacturing boring bits
US20040131436A1 (en) * 2002-10-10 2004-07-08 Markus Rompel Drill tool for a rotary hammer
US7097396B1 (en) 2000-02-16 2006-08-29 Kabushiki Kaisha Miyanaga Drill bit
US20070297867A1 (en) * 2005-02-22 2007-12-27 Weiler Donald R Pilot Drill with Pilot Drill and Coupon Retainers and Hot Tapping Machine Using the Same
US7909547B2 (en) 2005-10-08 2011-03-22 Milwaukee Electric Tool Corporation Replaceable tip for a bit or auger bit
US9339874B2 (en) 2006-03-02 2016-05-17 Milwaukee Electric Tool Corporation Cutting tool
US9500038B2 (en) 2013-02-01 2016-11-22 Milwaukee Electric Tool Corporation Auger bit with replaceable cutting bit

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19915304B4 (de) * 1999-03-22 2006-07-27 Robert Bosch Gmbh Bohrwerkzeug
DE19915305C2 (de) * 1999-04-03 2003-11-20 Hawera Probst Gmbh Bohrwerkzeug
DE10243403A1 (de) * 2002-09-18 2004-04-01 Hawera Probst Gmbh Verfahren zur Herstellung eines Werkzeugs, insbesondere eines Bohrers oder Fräsers
US7800122B2 (en) 2006-09-07 2010-09-21 Hong Kong Applied Science And Technology Research Institute Co., Ltd. Light emitting diode device, and manufacture and use thereof
DE102021204603A1 (de) 2021-05-06 2022-11-10 Robert Bosch Gesellschaft mit beschränkter Haftung Bohrwerkzeug

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR628665A (fr) * 1926-05-17 1927-10-27 Hand Tools Ltd Perfectionnements aux fraises rotatives ou à percussion destinées à perforer la pierre et les matières analogues
DE887631C (de) 1951-05-23 1953-08-24 Alfred Kunkel Steinbohrer
US2773672A (en) * 1952-09-17 1956-12-11 Ellis C Holmes Drilling bit
CH331438A (de) 1955-02-02 1958-07-31 Kunkel Alfred Gesteinsbohrer
DE2045896A1 (de) 1970-01-30 1972-03-23 Fischer Artur Schlagbohrdubeleinheit zum Bohren von Lochern und zum dann Setzen von Be festigungselementen
GB2035158A (en) * 1978-09-28 1980-06-18 Guex & Fils Sa Ph Bit for drilling stone
US4749051A (en) 1984-10-01 1988-06-07 Santrade Limited Drill steel
EP0361189A1 (de) 1988-09-12 1990-04-04 Narex Praha, Statni Podnik Bohrwerkzeug mit schraubenförmigem Schaft
US5096344A (en) * 1990-08-06 1992-03-17 Fischerwerke Artur Fischer Gmbh & Co., Kg Drill bit having bulb-like shank enlargements to reduce jamming
DE4306981A1 (de) 1993-03-05 1994-09-08 Keil Werkzeugfabrik Karl Eisch Bohrer für Gestein oder dergleichen

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR628665A (fr) * 1926-05-17 1927-10-27 Hand Tools Ltd Perfectionnements aux fraises rotatives ou à percussion destinées à perforer la pierre et les matières analogues
DE887631C (de) 1951-05-23 1953-08-24 Alfred Kunkel Steinbohrer
US2773672A (en) * 1952-09-17 1956-12-11 Ellis C Holmes Drilling bit
CH331438A (de) 1955-02-02 1958-07-31 Kunkel Alfred Gesteinsbohrer
DE2045896A1 (de) 1970-01-30 1972-03-23 Fischer Artur Schlagbohrdubeleinheit zum Bohren von Lochern und zum dann Setzen von Be festigungselementen
GB2035158A (en) * 1978-09-28 1980-06-18 Guex & Fils Sa Ph Bit for drilling stone
US4749051A (en) 1984-10-01 1988-06-07 Santrade Limited Drill steel
EP0361189A1 (de) 1988-09-12 1990-04-04 Narex Praha, Statni Podnik Bohrwerkzeug mit schraubenförmigem Schaft
US5096344A (en) * 1990-08-06 1992-03-17 Fischerwerke Artur Fischer Gmbh & Co., Kg Drill bit having bulb-like shank enlargements to reduce jamming
DE4306981A1 (de) 1993-03-05 1994-09-08 Keil Werkzeugfabrik Karl Eisch Bohrer für Gestein oder dergleichen

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7097396B1 (en) 2000-02-16 2006-08-29 Kabushiki Kaisha Miyanaga Drill bit
US20030180108A1 (en) * 2002-03-25 2003-09-25 Gongola Andrew G. Boring bit and methods for manufacturing boring bits
US6874978B2 (en) * 2002-03-25 2005-04-05 Milwaukee Electric Tool Corporation Boring bit and methods for manufacturing boring bits
US20040131436A1 (en) * 2002-10-10 2004-07-08 Markus Rompel Drill tool for a rotary hammer
US20070297867A1 (en) * 2005-02-22 2007-12-27 Weiler Donald R Pilot Drill with Pilot Drill and Coupon Retainers and Hot Tapping Machine Using the Same
US7909547B2 (en) 2005-10-08 2011-03-22 Milwaukee Electric Tool Corporation Replaceable tip for a bit or auger bit
US20110188955A1 (en) * 2005-10-08 2011-08-04 Kenneth Jordan Replaceable tip for a bit or auger bit
US8109700B2 (en) 2005-10-08 2012-02-07 Milwaukee Electric Tool Corporation Replaceable tip for a bit or auger bit
US9339874B2 (en) 2006-03-02 2016-05-17 Milwaukee Electric Tool Corporation Cutting tool
US10618119B2 (en) 2006-03-02 2020-04-14 Milwaukee Electric Tool Corporation Cutting tool
US9500038B2 (en) 2013-02-01 2016-11-22 Milwaukee Electric Tool Corporation Auger bit with replaceable cutting bit

Also Published As

Publication number Publication date
EP1015727A1 (de) 2000-07-05
DE59804344D1 (de) 2002-07-11
WO1998054435A1 (de) 1998-12-03
EP1015727B1 (de) 2002-06-05
DK1015727T3 (da) 2002-09-16
CN1257562A (zh) 2000-06-21
DE19722519A1 (de) 1998-12-03
CN1094168C (zh) 2002-11-13

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Effective date: 20090410